Climatological Report (Monthly)
Issued by NWS

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CXUS53 KIWX 012155
CLMSBN

CLIMATE REPORT
NATIONAL WEATHER SERVICE NORTHERN INDIANA
452 PM EST MON JAN 1 2018

...................................

...THE SOUTH BEND CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1893 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              70   12/05/2001
                        12/02/1982
 LOW              -18   12/28/1924
HIGHEST            61   12/04        MM      MM       53  12/26
LOWEST             -6   12/28        MM      MM      -14  12/19
AVG. MAXIMUM     32.9              35.2    -2.3     31.3
AVG. MINIMUM     18.1              22.4    -4.3     19.5
MEAN             25.5              28.8    -3.3
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     14              11.6     2.4       14
DAYS MIN <= 32     28              25.6     2.4       28
DAYS MIN <= 0       5               1.2     3.8        3

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.50   1965
 MINIMUM         0.60   1943
TOTALS           1.36              2.61   -1.25     1.99
DAILY AVG.       0.04              0.08   -0.04     0.06
DAYS >= .01        18              15.8     2.2       18
DAYS >= .10         3               6.9    -3.9        5
DAYS >= .50         0               1.2    -1.2        1
DAYS >= 1.00        0               0.3    -0.3        0
GREATEST
 24 HR. TOTAL    0.34   12/24 TO 12/24

SNOWFALL (INCHES)
RECORDS
 TOTAL          999.0   2013
TOTALS           32.4              17.3    15.1     23.7
SINCE 7/1        32.4              22.5     9.9     24.2
SNOWDEPTH AVG.      2                 3      -1        3
DAYS >= 1.0         9               5.1     3.9        8
GREATEST
 SNOW DEPTH         7   12/31
                        12/30
                        12/29
 24 HR TOTAL      8.7   12/24 TO 12/24

DEGREE_DAYS
HEATING TOTAL    1221              1122      99     1221
 SINCE 7/1       2404              2391      13     2122
COOLING TOTAL       0                 0       0        0
 SINCE 1/1        692               773     -81      950
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              10.3
HIGHEST WIND SPEED/DIRECTION    32/330    DATE  12/12
HIGHEST GUST SPEED/DIRECTION    46/180    DATE  12/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            7
NUMBER OF DAYS PC              6
NUMBER OF DAYS CLOUDY         18

AVERAGE RH (PERCENT)     79

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                4     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                3     SNOW                       8
LIGHT SNOW               15     SLEET                      0
FOG                      22     FOG W/VIS <= 1/4 MILE      6
HAZE                      9

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

&&

...IN WITH THE WARMTH, OUT WITH THE COLD...

AFTER A BRUTALLY COLD AND SNOWY STRETCH OF WEATHER TO END DECEMBER,
IT IS HARD TO REMEMBER THAT THE MONTH BEGAN WITH NEAR RECORD WARMTH
AND TEMPERATURES IN THE 50S AND 60S. THOSE WARM TEMPERATURES LASTED
ABOUT 5 DAYS BEFORE A 10 DAY STRETCH OF BELOW NORMAL TEMPERATURES
FOLLOWED BY ANOTHER PERIOD OF 8 DAYS ABOVE NORMAL. THAT WOULD BE THE
END TO ANY WARMTH THOUGH AS BITTERLY COLD AIR STRAIGHT OUT OF
SIBERIA FLUSHED INTO THE CENTRAL AND EASTERN UNITED STATES FOR THE
LAST 8 DAYS OF DECEMBER. TEMPERATURES WERE MORE THAN 20 DEGREES
BELOW NORMAL DURING THIS PERIOD WITH MEASURABLE SNOWFALL ON EVERY
DAY.

A FEW DAILY TEMPERATURE RECORDS WERE SET OR TIED DURING THE COLD END
TO THE MONTH. A RECORD COLD MAXIMUM TEMPERATURE OF 8 DEGREES WAS
RECORDED ON THE 26TH. THIS BROKE THE PREVIOUS RECORD OF 10 SET IN
1925.  THIS HIGH OF 8 DEGREES WAS ALSO THE 9TH COLDEST HIGH
TEMPERATURE EVER RECORDED IN DECEMBER. A RECORD COLD MAXIMUM
TEMPERATURE OF 12 DEGREES WAS ALSO RECORDED ON THE 31ST. THIS TIED
THE PREVIOUS RECORD SET IN 1899. THE MONTH ENDED WITH 6 STRAIGHT
DAYS HAVING HIGH TEMPERATURES LESS THAN 20 DEGREES. THIS WAS THE
SECOND LONGEST SUCH STREAK AT SOUTH BEND, SHY OF THE RECORD BY JUST
1 DAY. THE RECORD OF 7 CONSECUTIVE DECEMBER DAYS WITH HIGH
TEMPERATURES BELOW 20 DEGREES WAS SET IN 1901, 1917 AND 1958.

THE AVERAGE MONTHLY TEMPERATURE WAS 25.5, 3.3 DEGREES BELOW NORMAL.
THIS RANKED AS THE 31ST COLDEST DECEMBER ON RECORD. THE WARMEST
TEMPERATURE WAS 61 ON THE 4TH AND THE COLDEST WAS 6 BELOW ON THE
28TH. THE PERIOD OF DECEMBER 26TH TO DECEMBER 31ST HAD AN AVERAGE
TEMPERATURE OF 5.8 DEGREES WHICH WAS THE COLDEST EVER RECORDED
DURING THIS 6 DAY STRETCH.

PRECIPITATION FOR THE MONTH WAS 1.36 INCHES, 1.25 INCHES BELOW
NORMAL. THIS WAS THE 18TH DRIEST DECEMBER ON RECORD, YET MEASURABLE
PRECIPITATION FELL ON 18 DAYS. DESPITE HAVING WELL BELOW NORMAL
PRECIPITATION, SNOWFALL FOR THE MONTH WAS WELL ABOVE NORMAL. A TOTAL
OF 32.4 INCHES WAS RECORDED WHICH WAS 15.1 INCHES ABOVE NORMAL. THIS
RANKED AS THE 8TH SNOWIEST DECEMBER ON RECORD. THE DISPARITY BETWEEN
PRECIPITATION AND SNOWFALL WAS DUE TO THE VERY COLD TEMPERATURES AT
THE END OF THE MONTH. THIS CREATED VERY LARGE LIQUID TO SNOW RATIOS
WHICH LED TO VERY EFFICIENT SNOW MAKING PROCESSES.

$$
LASHLEY


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